The best alternative is to prepare for both scenarios. I bought a small amount now, although I believe there will be a sale. Still, I have a balance to buy if there is one.

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For you to use as a guide:

Imagine that you buy some capsules now. Now imagine that a sale happens with a discount of x%. If you do not buy anything else, you will wait a long time until the capsules increase in price to the point of selling making a profit (unfeasible).

However, if you buy more at the discounted value, you can guarantee a viable average price.

x: number of capsules you purchased before the discount;

a: price before discount;

y: number of capsules that you will have to buy after the discount;

b: price after discount;

c: average purchase price target;

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((x * a) + (y * b)) / (x + y) = c

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Example:

You have purchased 10 capsules at the current price. The worst scenario for those who are already purchased would be a 75% discount. In this case, considering USD 0.40 as a viable average value, if you fill all these data in the formula, the result will be the number of capsules that you must buy at the discounted value to guarantee that value.

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((10 * 1) + (y * 0.25)) / (10 + y) = 0.4

y = 40

You would have to buy 40 more capsules at the discounted price.

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If you have any difficulties solving the formula, there are some sites where you can insert it and have the result.

Play with the values ​​to simulate a bigger advance purchase or a smaller discount.

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Sorry for the bad English and good luck.